StockInsights React TypeScript

This is a React TypeScript conversion of the original StockInsights application. The application maintains the same functionality for analyzing stock price drops while using modern React patterns and TypeScript for better type safety.

Features

• Max Drop Analysis: Find the maximum percentage drop from peak to valley
• Longest Drop Analysis: Find the longest duration drop period (either recovered or ongoing)
• Interactive Stock Chart: Visualize stock price movements with ApexCharts
• Multiple Summary Panels: Compare analysis results across different stocks and time periods
• Stock Management: Add and remove stocks dynamically
• Responsive Design: Works on desktop and mobile devices

Technology Stack

• React 18 with TypeScript
• ApexCharts for data visualization
• Bootstrap 5 for UI components
• Modern Fetch API for data requests
• CSS Grid for responsive layouts

Project Structure

src/
├── components/           # React components
│   ├── StockChart.tsx   # ApexCharts integration
│   ├── SummaryPanel.tsx # Analysis results display
│   ├── ControlPanel.tsx # User controls
│   └── AddStockModal.tsx# Stock symbol picker
├── utils/               # Utility functions
│   ├── StockAnalyser.ts # Drop analysis calculations
│   └── ApiService.ts    # API communication
├── types/               # TypeScript interfaces
│   └── index.ts         # Type definitions
├── App.tsx              # Main application component
├── App.css              # Global styles
└── index.tsx            # Application entry point

Installation

1. Install dependencies:

   npm install

2. Start the development server:

   npm start

3. Open http://localhost:3000 to view it in the browser.

API Requirements

The application expects a backend API running on localhost:3000 with the following endpoints:

• GET /getdefaultlist - Returns default stock symbols
• GET /getsymbols - Returns all available stock symbols
• GET /:symbol - Returns historical price data for a symbol
• PUT /addstock?symbol=:symbol - Adds a new stock symbol
• PUT /deletestock?symbol=:symbol - Removes a stock symbol

Data Format Specification

Expected Raw Data Format from API

The GET /:symbol endpoint must return data in this exact format:

[
  "{\"Date\":\"12/2/2022\",\"Open\":20,\"High\":20.3799991607666,\"Low\":20,\"Close\":20.200000762939453,\"Volume\":1383500}",
  "{\"Date\":\"12/5/2022\",\"Open\":20.06999969482422,\"High\":20.100000381469727,\"Low\":19.899999618530273,\"Close\":19.93199920654297,\"Volume\":17900}",
  "{\"Date\":\"12/6/2022\",\"Open\":19.90999984741211,\"High\":19.975000381469727,\"Low\":19.84000015258789,\"Close\":19.91900062561035,\"Volume\":165200}",
  "{\"Date\":\"12/7/2022\",\"Open\":19.850000381469727,\"High\":19.940000534057617,\"Low\":19.799999237060547,\"Close\":19.86199951171875,\"Volume\":28900}",
  "{\"Date\":\"12/8/2022\",\"Open\":20.059999465942383,\"High\":20.059999465942383,\"Low\":19.979999542236328,\"Close\":20.027999877929688,\"Volume\":75600}"
]

Format Requirements:

• Array of JSON Strings: Each array element is a stringified JSON object
• All Data Elements: Every element contains actual price data (no header element)
• Data Elements: All elements should have consistent field structure
• Required Fields: Each data object must contain: Date, Open, High, Low, Close, Volume
• Date Format: MM/dd/yyyy string format
• Price Fields: Numeric values (can be integers or decimals)
• Volume: Integer representing trading volume

Critical Notes:

• The parser expects ALL data objects to have the same number of fields for consistency
• Missing fields will cause the entire data point to be skipped
• Date strings must be parseable by JavaScript's Date constructor
• This format is parsed by ApiService.convertRawDataToList() method

⚠️ For complete API documentation and format specifications, see docs/API_DATA_FORMAT.md

Mock Data: Reference implementation available at src/data/mockApiData.json for testing when API is unavailable.

Key Differences from Original

1. Component Architecture: Modular React components instead of monolithic JavaScript classes
2. Type Safety: Full TypeScript support with interfaces and type checking
3. Modern Patterns: React hooks, state management, and functional components
4. No jQuery: Pure React DOM manipulation
5. Modern API: Fetch API instead of jQuery AJAX
6. Responsive Grid: CSS Grid for better mobile support
7. Error Handling: Comprehensive error handling and loading states

Development

To build for production:

npm run build

To run tests:

npm test

Browser Support

• Chrome (latest)
• Firefox (latest)
• Safari (latest)
• Edge (latest)

The application uses modern JavaScript features and requires ES6+ support.